JP2015068488A - Vehicle driving force transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle driving force transmission device which achieves small mechanical loss of a differential gear mechanism part and properly prevents lowering of an oil surface level of a valve body chamber.SOLUTION: The vehicle driving force transmission device includes: a housing case 2 which forms a differential chamber 5 in which a differential gear mechanism part is provided; and a separator plate 6 disposed in the differential chamber 5. The vehicle driving force transmission device is formed so that an oil accumulated in the differential chamber 5 is drawn to the upper side by a ring gear 30 of the differential gear mechanism part to be used for lubrication of a predetermined portion. An oil guide part 7, which receives the oil drawn to the upper side by the ling gear 30 and then leads the oil to an oil introduction port 90 of a valve body chamber, is provided at the separator plate 6.

Description

  The present invention relates to a vehicle driving force transmission device for transmitting engine output to wheels.

The present applicant has previously proposed the one described in Patent Document 1 as an example of a vehicle driving force transmission device.
In the apparatus described in this document, a differential chamber in which a differential gear mechanism is incorporated is provided in a housing case that houses a transmission. Oil is stored in the differential chamber, and this oil is used to lubricate a predetermined portion by scooping up the oil of the differential gear mechanism by the ring gear. If the oil level in the differential chamber is high, the oil agitation resistance when the ring gear rotates increases and the mechanical loss also increases, so as a means to solve this, a separator plate is used to make the differential chamber an oil agitation chamber. And a non-stirring chamber. The non-stirring chamber is provided with an oil storage section capable of storing a certain amount of oil that has entered the non-stirring chamber beyond the upper portion of the separator plate.
According to such a configuration, it is possible to reduce the oil agitation resistance of the ring gear, reduce mechanical loss, and promote low fuel consumption. The oil that has entered the non-stirring chamber can be supplied from the reservoir to a predetermined lubrication target site while being stored in the oil reservoir.

  However, in the past, as described below, there is still room for improvement.

First, as matters to be noted in the vehicle driving force transmission device as described above, the following matters can be cited.
That is, even if the oil is scraped upward by the ring gear, if much of this oil flows down into the stirring chamber, the amount of oil in the stirring chamber does not decrease so much. In this case, the oil level height of the stirring chamber is high, and the stirring resistance of the ring gear cannot be made too small.
In the differential chamber, it is necessary to store an amount of oil necessary for lubricating each part of the differential gear mechanism, and the amount of oil is relatively large. On the other hand, the vehicle drive force transmission device is provided with a valve body chamber in which a valve body is arranged as a hydraulic control means for each part, and the valve body chamber and the differential chamber share oil. It is common. For this reason, if the amount of oil in the differential chamber is large, the oil level in the valve body chamber cannot be made too high, and there is a concern that air suction of the valve body strainer may occur.
According to Patent Document 1, among the two matters described above, the former matter can be solved, but the latter matter for maintaining the oil level of the valve body chamber at a high state cannot be solved appropriately. .

Japanese Patent No. 4574511

  The present invention has been conceived under the circumstances as described above, and can reduce the mechanical loss of the differential gear mechanism and appropriately prevent the oil level of the valve body chamber from being lowered. It is an object of the present invention to provide a vehicular driving force transmission device that can be used.

  In order to solve the above problems, the present invention takes the following technical means.

  A vehicle driving force transmission device provided by the present invention includes a housing case that internally forms a differential chamber in which a differential gear mechanism is provided, and a separator plate disposed in the differential chamber. The oil stored in the differential chamber is scraped upward by the ring gear of the differential gear mechanism and is used for lubricating a predetermined portion. In the housing case, an oil inlet for the valve body chamber is provided in a peripheral wall portion of the differential chamber, and the separator plate receives oil scraped upward by the ring gear. The oil guide portion that leads to the oil inlet of the valve body chamber is provided integrally or separately.

According to such a configuration, the following effects can be obtained.
That is, since the oil in the differential chamber can be fed into the valve body chamber using agitation of the ring gear, the oil level in the differential chamber can be lowered. Therefore, it is possible to reduce the mechanical loss by reducing the oil stirring resistance by the ring gear. On the other hand, since oil is supplied to the valve body chamber, the oil surface height of the valve body chamber can be increased, so that problems such as air suction in the strainer can be prevented.
Since oil supply from the differential chamber to the valve body chamber is performed using a separator plate, equipment such as an oil pump is unnecessary, and an increase in manufacturing cost can be suitably suppressed.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

1 is a plan view showing an overall schematic configuration of a vehicle driving force transmission device according to the present invention. It is principal part sectional drawing of the differential gear mechanism part of the driving force transmission device for vehicles shown in FIG. It is a principal part front view which shows the attachment state of the separator plate provided in the differential gear mechanism part shown in FIG. It is a disassembled perspective view which shows the principal part structure of the driving force transmission device for vehicles shown in FIG. It is a principal part disassembled perspective view of FIG.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  A vehicle driving force transmission device S shown in FIG. 1 is for transmitting a driving force of an output shaft 10 of an engine (not shown) to a pair of left and right axle shafts 11 and 11a. A torque converter 12, a transmission (not shown), and a differential gear mechanism D connected to an output shaft 10 of the engine are incorporated in a housing case 2 configured by combining the cases 21 and 22. The transmission is, for example, a belt type continuously variable transmission or a gear type stepped transmission, but the type thereof is not limited. In the lower region of the housing case 2, a valve body chamber 9 is provided in which a valve body (not shown) for performing hydraulic control of each part such as a transmission is arranged in the oil sump.

The differential gear mechanism D has the same basic structure as the conventional one except for the configuration related to the separator plate 6 described later. That is, as shown in FIG. 2, the differential gear mechanism D includes a ring gear 30 that receives the rotational force from the transmission, a differential case 31 that is connected to the ring gear 30 at one end, and a pin 40 connected to the differential case 31. A pair of pinion gears 41 and 41a are attached, and side gears 42 and 42a that mesh with these and are attached to the axle shafts 11 and 11a. One axle shaft 11 a passes through the side wall portion 21 a of the first case 21, and the other axle shaft 11 passes through the side wall portion 22 a of the second case 22. Lubricating oil is stored in the differential chamber 5 in which the differential gear mechanism D is disposed.

  The separator plate 6 includes a substantially inclined cylindrical differential case cover portion 60 that covers the periphery of the differential case 31, an upright plate portion 61 connected to the front end portion of the differential case cover portion 60, and an upper portion of the upright plate portion 61 extending obliquely upward. The extending portion 62 is provided at a position higher than the ring gear 30, the flange portion 63 is provided on the extending portion 62, and the oil receiving portion 64. Further, the separator plate 6 is attached with a later-described oil guide portion 7 configured separately from the separator plate 6.

  The upright plate portion 61 is located on the back side (the differential case 31 side) of the ring gear 30 and divides the differential chamber 5 into a stirring chamber 50A and a non-stirring chamber 50B. As shown in FIGS. 3 to 5, the upright plate portion 61 is provided with a fan-shaped notch 61 a having an angle range of 90 degrees, for example. According to the present embodiment, the oil level of the differential chamber 5 can be lowered immediately after the engine is started and a part of the upright plate portion 61 is not required to completely partition the lower region of the differential chamber 5. This is because the effect of sufficiently reducing the oil stirring resistance of the ring gear 30 is obtained by the configuration in which the stirring chamber 50A is partitioned. However, it goes without saying that the notch portion 61a may not be provided in the upright plate portion 61.

  The differential case cover part 60 is a part for preventing oil falling after being scraped up by the ring gear 30 from hitting the differential case 31. In the present embodiment, a part of the lower side of the differential case cover portion 60 is cut out as in the case of the upright plate portion 61 described above, but the oil drop prevention function on the differential case 31 is sufficiently provided. ing. Needless to say, the differential case cover 60 may have a cylindrical shape surrounding the entire circumference of the differential case 31.

  An opening 65 is provided in the extending portion 62 of the upright plate portion 61. The opening 65 is a part for allowing the oil scooped up by the ring gear 30 to advance to the non-stirring chamber 50B on the back side (the differential case cover 60 side) of the upright plate part 61. As shown in FIG. 3, the differential case cover 60 is provided with an oil stopper rib 66 erected, and an oil reservoir 67 is provided on the base side thereof. The oil reservoir 67 is a corner formed by the intersection of the stopper rib 66 and the differential case cover 60. When the oil passes through the opening 65 and proceeds to the non-stirring chamber 50 </ b> B, the oil flows downward after hitting the stopper rib 66 and is stored in the oil reservoir 67. As shown in FIG. 2, the oil accumulated here flows toward the bearing 48 and the oil seal 49 of the axle shaft 11a and is used for lubrication of this portion.

  As shown in FIGS. 3 and 4, the flange portion 63 provided in the extending portion 62 is a portion for efficiently guiding the oil scraped up by the ring gear 30 to the oil receiving portion 64. It protrudes from the extended portion 62 to the near side so as to be positioned around 65. The oil receiving portion 64 is a portion that can receive the oil transmitted through the flange portion 63 and can store an appropriate amount of oil. It has a protruding plate shape. As a means for increasing the amount of oil stored in the oil receiving portion 64, the oil receiving portion 64 has a lower height on the proximal end side than the distal end side, and an upright portion is formed on the distal end portion. Yes.

The oil guide portion 7 has a form as shown in FIGS. 4 and 5, and a back plate portion 70 standing up and down and an oil provided at a lower portion or an intermediate height position of the back plate portion 70. And an outflow portion 71. The oil outflow part 71 is a form which has the horizontal wall which protruded in the near side from the backplate part 70, and a pair of standing wall which stood up upwards located in the both sides. As shown in FIG. 4, the oil guide portion 7 is attached so as to be positioned below the oil receiving portion 64. When oil flows from the oil receiving portion 64 to the lower side on the near side, the oil is transferred to the back plate. It is possible to guide the oil outflow portion 71 after flowing along the portion 70.

  As shown in FIG. 4, the oil introduction port 90 of the valve body chamber 9 is opened in the side wall portion 22 a that faces the first case 21 and defines the differential chamber 5 in the second case 22. Is provided. The oil outflow portion 71 of the oil guide portion 7 is set so as to allow oil to flow into the oil introduction port 90.

  As shown in FIGS. 4 and 5, a pair of ribs 28 are provided in a portion corresponding to one side of the differential case 31 in the wall portion constituting the differential chamber 5. The rib 28 is a part that forms an oil ejection path, and oil ejected from an oil ejection means (not shown) can be supplied to the differential case 31 through a path between the pair of ribs 28. ing. The separator plate 6 is provided with a notch 69 for avoiding interference with the ribs 28. On the other hand, the oil guide portion 7 is located on the near side of the above-described oil ejection region and is provided so as not to hinder the above-described oil injection.

  Next, the operation of the vehicle driving force transmission device S will be described.

  First, some of the oil scraped up by the ring gear 30 proceeds from the opening 65 to the non-stirring chamber 50B. This oil is stored in the oil reservoir 67 shown in FIG. 3 and then used for lubricating the bearing 48 and the oil seal 49. As other oils, there is oil that is supplied toward the valve body chamber 9 after being received by the oil receiving portion 64 by the guide of the flange portion 63. Therefore, in the present embodiment, a large amount of oil that has been scraped up by the ring gear 30 is not returned to the stirring chamber 50A as it is. Therefore, even when the oil level in the differential chamber 5 is high when the engine is stopped, the oil level can be lowered immediately after starting the engine, the oil stirring resistance of the ring gear 30 can be reduced, and the mechanical loss can be reduced. it can. Further, since the oil scooped up by the ring gear 30 is prevented from hitting the differential case 31, the presence of the separator plate 6 prevents the mechanical loss.

  On the other hand, as described above, a part of the oil scooped up by the ring gear 30 is sent to the valve body chamber 9. Therefore, it is possible to maintain the oil level height of the valve body chamber 9 at a high level and prevent the strainer from sucking air. Oil supply to the valve body chamber 9 is performed using the separator plate 6 and the oil guide portion 7, and it is not necessary to use a special device such as an oil pump. Therefore, the configuration is reasonable, and an increase in manufacturing cost can be suitably suppressed.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the vehicle driving force transmission device according to the present invention can be varied in design in various ways within the intended scope of the present invention.

  In the above-described embodiment, the oil guide portion is configured using a member different from the separate plate. However, the present invention is not limited to this, and may be configured integrally with the separator plate. The “separator plate” in the present invention is a member that divides the differential chamber into two or more chambers. In the above-described embodiment, as can be understood from the fact that the separator plate is provided with the notch 61a, when the differential chamber is divided into the stirring chamber and the non-stirring chamber, these are almost completely cut off. There is no need to be. The specific position of the oil inlet of the valve body chamber is not limited, and the point is that it may be provided at any position on the peripheral wall portion of the differential chamber. The specific configuration of the oil guide portion can be changed as appropriate according to the position of the oil inlet.

D differential gear mechanism S vehicle driving force transmission device 2 housing case 21, 22 first and second housing case 22a side wall (periphery wall of differential chamber)
30 Ring gear 5 Differential chamber 6 Separator plate 7 Oil guide 9 Valve body chamber 90 Oil inlet (in the valve body chamber)

Claims (1)

A housing case in which a differential chamber provided with a differential gear mechanism is formed;
A separator plate disposed in the differential chamber;
With
A vehicle driving force transmission device configured such that oil stored in the differential chamber is scraped upward by a ring gear of the differential gear mechanism and used for lubrication of a predetermined part,
In the housing case, an oil inlet for the valve body chamber is provided in a peripheral wall portion of the differential chamber,
The separator plate is provided with an oil guide part that receives oil scraped upward by the ring gear and then guides it to the oil inlet of the valve body chamber, either integrally or separately. Vehicle driving force transmission device.

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